if you activate a hidden ‘Hard Mode’ in Undertale.
During the end battle with Toriel About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators Undertale Fanmade Boss Fights! With commentary / reactions. Undertale battle mode secrets We know that this one isn't really a battle, but just as a perfect example of the way that Undertale likes to subvert the genre that it chooses to be a part of, we love this battle.